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The Chemical Educator

ISSN: 1430-4171 (electronic version)

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Abstract Volume 7 Issue 1 (2002) pp 1-6

How to Recognize Disjoint Hydrocarbons: A Hückel Theory Topic

Richard Francis Langler

Department of Natural Science and Mathematics, University of Charleston, Charleston, West Virginia 25304
Received May 9, 2001. Accepted September 6, 2001

Published online: 21 December 2001

Abstract. Categorizing even alternant hydrocarbons as joint or disjoint serves as the basis for differentiating between antiaromatic, Y-antiaromatic and very Y-antiaromatic structures. Both previously proposed methods for categorizing even alternant hydrocarbons as joint or disjoint are unreliable. A new approach is presented and shown to be both conveniently applicable and reliable. Because this topic bridges Hückel theory and modern structural concerns, it is suitable for inclusion in undergraduate Hückel theory courses.

Key Words:  In the Classroom; organic chemistry; Hückel

(*) Corresponding author. (E-mail: rlangler@mta.ca)

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Issue date: February 1, 2002

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